If the water penetrates the mackintosh in a few places only, obtain from a rubber warehouse some rubber cloth in the piece as near like the coat as possible; also get some rubber solution. Cut the rubber into circles large enough to cover the leaks, spread the rubber solution upon them, and also upon the mackintosh inside wherever a leak occurs, and press the circles of rubber into place. Press under a weight for a day or two. The mackintosh should be thoroughly dry before being treated.